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<p>Sure, I'm actually in the process.</p>
<p>Here are the x, y and z-vertex positions before and after the rotationFix (BSC_MollerCandidates).</p>
<p>The fix appears to shift the x-position back toward the origin by ~<span class="cwcot" id="cwos">74.32 microns, but the beamspot is still centered at -71.38 microns:</span></p>
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<p><img tabindex="0" id="462676_rs|3" style="width: 685px; height: 496.556px;" contenttype="image/png" size="18018" src="cid:6dfa7612-2e20-4f15-a698-0f781fab0c8d"></p>
<p><img tabindex="0" id="434170_rs|3" style="width: 635px; height: 460.297px;" contenttype="image/png" size="16258" src="cid:d095bfd8-b4f4-4e0f-a6d8-339747e0a5bf"><br>
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<p><img tabindex="0" id="171638_rs|3" style="width: 627px; height: 454.512px;" contenttype="image/png" size="15926" src="cid:8a63db3e-2ff0-48c6-ba3a-fec5176795ad"></p>
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<p><b>Old</b> Vtx_x:<br>
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<p><img tabindex="0" id="img715608" style="max-width: 99.9%;" contenttype="image/gif" size="12313" src="cid:5d45ba98-2050-49fc-96aa-49d6d159967a"></p>
<p><b>Fixed</b> Vtx_x:</p>
<p><img tabindex="0" id="706977_rs|3" style="width: 640px; height: 436.447px;" contenttype="image/gif" size="13447" height="436" width="640" src="cid:50dff075-b9c3-4cc1-a874-abde00ceb71c"></p>
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<p>The Vtx_z appears to be shifted more toward -3.8mm instead of -5.0mm:</p>
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<p><img tabindex="0" id="img185581" style="max-width: 99.9%;" contenttype="image/gif" size="9797" src="cid:19e50cdd-afae-4525-9093-e159fe3b7977"><br>
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<p>Most other distributions that I checked look the same.<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>From:</b> hps-software@SLAC.STANFORD.EDU <hps-software@SLAC.STANFORD.EDU> on behalf of Graf, Norman A. <ngraf@slac.stanford.edu><br>
<b>Sent:</b> Wednesday, May 17, 2017 4:44:10 PM<br>
<b>To:</b> hps-software; hps-analysis@jlab.org<br>
<b>Subject:</b> Beam position @ target</font>
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<div class="PlainText">Hello All,<br>
<br>
I think it would be useful to analyze our MC Møller samples from before and after the rotation fix. This would provide us with an estimate of our sensitivity in determining the target z position, the beam position at the target and the beam direction at the
target. It would also expose any systematics in our current methodologies.<br>
<br>
Sebouh, Bradley, would either of you be willing and able to do this?<br>
<br>
Norman<br>
<br>
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